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Message-ID: <20231208101244.1019034-3-edumazet@google.com>
Date: Fri, 8 Dec 2023 10:12:44 +0000
From: Eric Dumazet <edumazet@...gle.com>
To: "David S . Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>
Cc: David Ahern <dsahern@...nel.org>, netdev@...r.kernel.org, eric.dumazet@...il.com,
Eric Dumazet <edumazet@...gle.com>
Subject: [PATCH net-next 2/2] ipv6: annotate data-races around np->ucast_oif
np->ucast_oif is read locklessly in some contexts.
Make all accesses to this field lockless, adding appropriate
annotations.
This also makes setsockopt( IPV6_UNICAST_IF ) lockless.
Signed-off-by: Eric Dumazet <edumazet@...gle.com>
---
net/ipv6/datagram.c | 2 +-
net/ipv6/icmp.c | 4 +--
net/ipv6/ipv6_sockglue.c | 58 ++++++++++++++++++----------------------
net/ipv6/ping.c | 4 +--
net/ipv6/raw.c | 2 +-
net/ipv6/udp.c | 2 +-
net/l2tp/l2tp_ip6.c | 2 +-
7 files changed, 34 insertions(+), 40 deletions(-)
diff --git a/net/ipv6/datagram.c b/net/ipv6/datagram.c
index 1804bd6f46840f39deb3ceeb7835cd167e1ec86c..fff78496803da6158d8b6e70255a56f183e26a80 100644
--- a/net/ipv6/datagram.c
+++ b/net/ipv6/datagram.c
@@ -62,7 +62,7 @@ static void ip6_datagram_flow_key_init(struct flowi6 *fl6,
if (ipv6_addr_is_multicast(&fl6->daddr))
oif = READ_ONCE(np->mcast_oif);
else
- oif = np->ucast_oif;
+ oif = READ_ONCE(np->ucast_oif);
}
fl6->flowi6_oif = oif;
diff --git a/net/ipv6/icmp.c b/net/ipv6/icmp.c
index f84a465c9759b6c3d43a80a65dac32d516219c60..1635da07285f263509a68624369a2746f3deb076 100644
--- a/net/ipv6/icmp.c
+++ b/net/ipv6/icmp.c
@@ -586,7 +586,7 @@ void icmp6_send(struct sk_buff *skb, u8 type, u8 code, __u32 info,
if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr))
fl6.flowi6_oif = READ_ONCE(np->mcast_oif);
else if (!fl6.flowi6_oif)
- fl6.flowi6_oif = np->ucast_oif;
+ fl6.flowi6_oif = READ_ONCE(np->ucast_oif);
ipcm6_init_sk(&ipc6, sk);
ipc6.sockc.mark = mark;
@@ -772,7 +772,7 @@ static enum skb_drop_reason icmpv6_echo_reply(struct sk_buff *skb)
if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr))
fl6.flowi6_oif = READ_ONCE(np->mcast_oif);
else if (!fl6.flowi6_oif)
- fl6.flowi6_oif = np->ucast_oif;
+ fl6.flowi6_oif = READ_ONCE(np->ucast_oif);
if (ip6_dst_lookup(net, sk, &dst, &fl6))
goto out;
diff --git a/net/ipv6/ipv6_sockglue.c b/net/ipv6/ipv6_sockglue.c
index fe7e96e69960c013e84b48242e309525f7f618da..9e8ebda170f14f7fd5faf370507bb3a8d1c75931 100644
--- a/net/ipv6/ipv6_sockglue.c
+++ b/net/ipv6/ipv6_sockglue.c
@@ -537,6 +537,31 @@ int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
}
WRITE_ONCE(np->mcast_oif, val);
return 0;
+ case IPV6_UNICAST_IF:
+ {
+ struct net_device *dev;
+ int ifindex;
+
+ if (optlen != sizeof(int))
+ return -EINVAL;
+
+ ifindex = (__force int)ntohl((__force __be32)val);
+ if (!ifindex) {
+ WRITE_ONCE(np->ucast_oif, 0);
+ return 0;
+ }
+
+ dev = dev_get_by_index(net, ifindex);
+ if (!dev)
+ return -EADDRNOTAVAIL;
+ dev_put(dev);
+
+ if (READ_ONCE(sk->sk_bound_dev_if))
+ return -EINVAL;
+
+ WRITE_ONCE(np->ucast_oif, ifindex);
+ return 0;
+ }
}
if (needs_rtnl)
rtnl_lock();
@@ -857,37 +882,6 @@ int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
break;
}
-
- case IPV6_UNICAST_IF:
- {
- struct net_device *dev = NULL;
- int ifindex;
-
- if (optlen != sizeof(int))
- goto e_inval;
-
- ifindex = (__force int)ntohl((__force __be32)val);
- if (ifindex == 0) {
- np->ucast_oif = 0;
- retv = 0;
- break;
- }
-
- dev = dev_get_by_index(net, ifindex);
- retv = -EADDRNOTAVAIL;
- if (!dev)
- break;
- dev_put(dev);
-
- retv = -EINVAL;
- if (sk->sk_bound_dev_if)
- break;
-
- np->ucast_oif = ifindex;
- retv = 0;
- break;
- }
-
case IPV6_ADD_MEMBERSHIP:
case IPV6_DROP_MEMBERSHIP:
{
@@ -1369,7 +1363,7 @@ int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
break;
case IPV6_UNICAST_IF:
- val = (__force int)htonl((__u32) np->ucast_oif);
+ val = (__force int)htonl((__u32) READ_ONCE(np->ucast_oif));
break;
case IPV6_MTU_DISCOVER:
diff --git a/net/ipv6/ping.c b/net/ipv6/ping.c
index 465e8d0040671f689e0e5e1f24c024c356ce0fd1..ef2059c889554aaae237ed2cddca0b5402c77bbb 100644
--- a/net/ipv6/ping.c
+++ b/net/ipv6/ping.c
@@ -109,7 +109,7 @@ static int ping_v6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
if (!oif && ipv6_addr_is_multicast(daddr))
oif = READ_ONCE(np->mcast_oif);
else if (!oif)
- oif = np->ucast_oif;
+ oif = READ_ONCE(np->ucast_oif);
addr_type = ipv6_addr_type(daddr);
if ((__ipv6_addr_needs_scope_id(addr_type) && !oif) ||
@@ -159,7 +159,7 @@ static int ping_v6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr))
fl6.flowi6_oif = READ_ONCE(np->mcast_oif);
else if (!fl6.flowi6_oif)
- fl6.flowi6_oif = np->ucast_oif;
+ fl6.flowi6_oif = READ_ONCE(np->ucast_oif);
pfh.icmph.type = user_icmph.icmp6_type;
pfh.icmph.code = user_icmph.icmp6_code;
diff --git a/net/ipv6/raw.c b/net/ipv6/raw.c
index 59a1e269a82c1af6eb73570ef7a43e0f0f61ab80..03dbb874c363bfa796631c1c3cc49895aae56c5a 100644
--- a/net/ipv6/raw.c
+++ b/net/ipv6/raw.c
@@ -878,7 +878,7 @@ static int rawv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr))
fl6.flowi6_oif = READ_ONCE(np->mcast_oif);
else if (!fl6.flowi6_oif)
- fl6.flowi6_oif = np->ucast_oif;
+ fl6.flowi6_oif = READ_ONCE(np->ucast_oif);
security_sk_classify_flow(sk, flowi6_to_flowi_common(&fl6));
if (hdrincl)
diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index 0b7c755faa77b1ddd4feb5dea185f6dd7be45091..594e3f23c12909fe6f245bf31057278169cd85c5 100644
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -1544,7 +1544,7 @@ int udpv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
fl6->flowi6_oif = READ_ONCE(np->mcast_oif);
connected = false;
} else if (!fl6->flowi6_oif)
- fl6->flowi6_oif = np->ucast_oif;
+ fl6->flowi6_oif = READ_ONCE(np->ucast_oif);
security_sk_classify_flow(sk, flowi6_to_flowi_common(fl6));
diff --git a/net/l2tp/l2tp_ip6.c b/net/l2tp/l2tp_ip6.c
index 17301f9dd228db80be1bdc3cb858ac41d5268e36..dd3153966173db09d42de02fa3ad4d44d05620f4 100644
--- a/net/l2tp/l2tp_ip6.c
+++ b/net/l2tp/l2tp_ip6.c
@@ -601,7 +601,7 @@ static int l2tp_ip6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr))
fl6.flowi6_oif = READ_ONCE(np->mcast_oif);
else if (!fl6.flowi6_oif)
- fl6.flowi6_oif = np->ucast_oif;
+ fl6.flowi6_oif = READ_ONCE(np->ucast_oif);
security_sk_classify_flow(sk, flowi6_to_flowi_common(&fl6));
--
2.43.0.472.g3155946c3a-goog
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